1. [adj]  loaded with something that hinders motion; "The wings of birds were clogged with ice and snow"-Dryden
2. [adj]  stopped up; clogged up; "clogged pipes"; "clogged up freeways"; "streets choked with traffic"
3. [adj]  thickened or coalesced in soft thick lumps (such as clogs or clots); "clotted blood"; "seeds clogged together"

CLOGGED is a 7 letter word that starts with C.